PLUGS 0414S4 Performance Spark Plug, 4PK

Accel's Shorty spark plugs keep your spark plug boots from being burned and your headers from being dented if you don't have enough room between your plug boots and your exhaust manifold or headers. Designed for trouble-free installation and removal in cramped spaces these high-performance plugs are much easier than OE plugs to get a socket on but still deliver a larger hotter fuller flash front and significantly more power at high rpm. You'll have instant throttle response and better fuel economy with less fouling flame dissipation and misfire. These copper-core plugs provide increased thermal conductivity come with machine-rolled 14 mm threads to protect your heads use a standard 5/8 socket. Features -Header-Box -U-Groove Ground Electrode -Five-Rib Aluminum Insulator -Copper Core Nickel/Chrome Steel -Electric Heat Seal -Copper-Glass Gas-Tight Seal -Less Flame Dissipation -Pack - 4